﻿// Adapted from OpenTK's Mac Platform
//
// Class.cs
//
// Author:
//       Olle Håkansson <ollhak@gmail.com>
//
// Copyright (c) 2014 Olle Håkansson
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//


using System.Runtime.InteropServices;
using System;
using System.Collections.Generic;

namespace LibreLancer.Platforms.Mac
{
	static class Class
	{
		public static readonly IntPtr NSAutoreleasePool = Get ("NSAutoreleasePool");
		public static readonly IntPtr NSDictionary = Get ("NSDictionary");
		public static readonly IntPtr NSMutableDictionary = Get("NSMutableDictionary");
		public static readonly IntPtr NSNumber = Get ("NSNumber");
		public static readonly IntPtr NSUserDefaults = Get ("NSUserDefaults");

		[DllImport (Cocoa.LibObjC)]
		extern static IntPtr class_getName (IntPtr handle);

		[DllImport (Cocoa.LibObjC)]
		extern static bool class_addMethod (IntPtr classHandle, IntPtr selector, IntPtr method, string types);

		[DllImport (Cocoa.LibObjC)]
		extern static IntPtr objc_getClass (string name);

		[DllImport (Cocoa.LibObjC)]
		extern static IntPtr objc_allocateClassPair (IntPtr parentClass, string name, int extraBytes);

		[DllImport (Cocoa.LibObjC)]
		extern static void objc_registerClassPair (IntPtr classToRegister);

		[DllImport (Cocoa.LibObjC)]
		extern static void objc_disposeClassPair (IntPtr cls);

		public static IntPtr Get (string name)
		{
			var id = objc_getClass (name);
			if (id == IntPtr.Zero) {
				throw new ArgumentException ("Unknown class: " + name);
			}
			return id;
		}

		public static IntPtr AllocateClass (string className, string parentClass)
		{
			return objc_allocateClassPair (Get (parentClass), className, 0);
		}

		public static void RegisterClass (IntPtr handle)
		{
			objc_registerClassPair (handle);
		}

		public static void DisposeClass (IntPtr handle)
		{
			objc_disposeClassPair (handle);
		}

		public static void RegisterMethod (IntPtr handle, Delegate d, string selector, string typeString)
		{
			// TypeString info:
			// https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html

			IntPtr p = Marshal.GetFunctionPointerForDelegate (d);
			bool r = class_addMethod (handle, Selector.Get (selector), p, typeString);

			if (!r) {
				throw new ArgumentException ("Could not register method " + d + " in class + " + class_getName (handle));
			}
		}
	}
}


